Device for drawing metal tooth-caps.



No. 726,772". PATENTED APR. 28, 1903.

' M. SHARP. v

DEVICE EUR DRAWING METAL TOOTH CAPS.

APrLIoATroN FILED JUNE 6. 1901. nnwnn ma. 21. 1903. No 11011111.. 2 sums-SHEET 1.

PATENTED AER. 28, 41903..

W. M. SHARP.

DEVICE EoR DRAWING METAL TooTE CAPs.

.APPLICATION FILED JUNE 6, 1901. EEINEWBD PEB. 2]..l 1903.

- 2 SHEETS-SHEET 2.

ivo MODEL.

. [NVE/V705'. 'f I TTOHNEY viluminan STATES PATENT @Fries WARREN M. SHARP, OF BINGHAMTON, NEWr YORK..

DEvlcsFoR DRAWING' METAL TOOTH-CAPS.

SPECIFICATION forming part of Letters Patent No. 723,772, dated April 28, 190.3.

Application iiled .Tune 6, 1901. Renewed February 2l, 1903. Serial No. 144,529. (No model.)

To all whom it may concern:

Be it known that I, WARREN M. SHARP, a subject of the King of Great Britain, residing at Binghamton, in the county of Broome and State of New York, have invented new and useful Improvements in Devices for Drawing Metal Tooth-Caps, of which the following is a specification.

My invention relates to dental appliances for drawing cups or caps from disks forv use in forming seamless metal tooth-crowns; and the object of the same is to provide a device of this character by which the number of draws can be greatly reduced and which enables several to be made at one time.

With these objects in view I have designedthe simple and novel construction described in this specification, and claimed, and illustrated in the accompanying drawings, forming a part thereof, in which- Figure 1 is a perspective of my device. Fig. 2 is a vertical longitudinal section of the same. Fig. 3 is a horizontal section on the line 3 3, Fig. 2. Fig. 4. is a perspective of the starting-clamp.

Like numerals of reference designate like parts in the different views of the drawings.

The numeral 1 designates the base of my device, which is apertured at 2 to accommodate screws or bolts for attaching it to a workbench. Formed integral with the basel is a yoke-shaped frame 3, having side bars 4 and a horizontal cross-bar 5, pierced centrally by a threaded aperture 6. A` screw 7 is fitted within the aperture 6 and is provided with a lever 8, passed through itsnpper end, while its lower end bears a revoluble die-plate 9. The die-plate 9 carries a series of punches 10, rigidly secured to the plate and located with their centers on the circumference of a circle.'V The punches 10 are rounded off on their edges l1 to keep from cutting the metal and are set slightly converging toward the centerfor a purpose which will appear.

Located parallel to the die-plate 9 is a xed die-plate 12, which is mounted to turn on a vertical axle 13, screwed into a stud 1li, integral with the base 1. AThe plate12 is pierced by a series-of circular perpendicular apertures 15, corresponding to the punches lO and placed in alinement therewith. To preserve plate 9.

ldown through the plate 12.

this alinement and enable the two die-plates 9 and 12 to be turned in unison, three guiderods 16 are rigidly mounted in the plate 12 and extend up through apertures 17 in the The two largest of the apertures 15 are rearned out on the upper edge at 18 to accommodate a disk out of which the cap is to be drawn. To keepthis disk from rumpling on the edges in starting to draw it, a starter isemployed, which consists of a U- shaped clamp 19, having parallel arms 20, apertured at 21. The clamp 19 is designed to fit over the edge of the plate l2, with the apertures 21 thereon in register with the largest aperture 15 therein. A set-screw 22 is fitted in an aperture in the frame 3 and serves to hold the plate 12 in position against turning.

` ln using my device a circular disk of gold is placed overthe largesthole 15, the starting-clamp` 19 placed thereon, and the lever 'operated to draw the disk and push Vthe cap The resulting cap will adhere tightly to the punch 10; but in retracting the punch, since it is set to slightly converge, as before stated, the inner edge of the cap will contact with the bottom of the plate 12 and strip the cap o. The cap thus formed may now be further reduced by placing it over one of the smaller holes 15. Three draws sufiice to finish the smallest cap. In order to expedite the work, several caps maybe started and then placed'on the machine and all drawn simultaneously. Since both die-plates 9 and 12 are mounted to be revolved, they maybe turned to bring the work always in front and clamped in that position bymeans of the set-screw 22.

I do'not wish to be limited as to details of construction, as these may be modified in '.many particulars without departing from the spirit of my invention. I

VHaving thus described my invention, what I claimlas new, and wish to secure by Letters 1. In a device of the class described, the combination, of a die-plate mounted to turn and having agraduated series of apertures therein, a die-plate bearing a series of punches corresponding to the aperture in said dieplate, guide-rods connecting said die-plates, a frame, 'a screw mounted in said frame and connected to said punch-bearing die-plate,

IOO

fbearing a lever, a revoluble die-plate secured and means for operating said screw, substantially as described.

2. A starter consisting of a U-shaped inember having aperiured arms, substantiallyT as described.

3. In a device of the class described, the l ing punches, a revoluble die-plate having a series of apertures therein corresponding to said punches, and guide-rods connecting said die-plate, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing Witcombination with a base having a yoke-shaped messes. frame formed integral therewith; a screw WARREN M. SHARP. mounted in the cross-bar of said frame and Witnesses:

to said screw and bearing?T a series of converg- 

